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   1  /*
   2   * Javascript for module editWarning
   3   */
   4  ( function ( mw, $ ) {
   5      'use strict';
   6  
   7      $( function () {
   8          var savedWindowOnBeforeUnload,
   9              $wpTextbox1 = $( '#wpTextbox1' ),
  10              $wpSummary = $( '#wpSummary' );
  11          // Check if EditWarning is enabled and if we need it
  12          if ( $wpTextbox1.length === 0 ) {
  13              return true;
  14          }
  15          // Get the original values of some form elements
  16          $wpTextbox1.add( $wpSummary ).each( function () {
  17              $( this ).data( 'origtext', $( this ).val() );
  18          } );
  19          $( window )
  20              .on( 'beforeunload.editwarning', function () {
  21                  var retval;
  22  
  23                  // Check if the current values of some form elements are the same as
  24                  // the original values
  25                  if (
  26                      mw.config.get( 'wgAction' ) === 'submit' ||
  27                          $wpTextbox1.data( 'origtext' ) !== $wpTextbox1.textSelection( 'getContents' ) ||
  28                          $wpSummary.data( 'origtext' ) !== $wpSummary.textSelection( 'getContents' )
  29                  ) {
  30                      // Return our message
  31                      retval = mw.msg( 'editwarning-warning' );
  32                  }
  33  
  34                  // Unset the onbeforeunload handler so we don't break page caching in Firefox
  35                  savedWindowOnBeforeUnload = window.onbeforeunload;
  36                  window.onbeforeunload = null;
  37                  if ( retval !== undefined ) {
  38                      // ...but if the user chooses not to leave the page, we need to rebind it
  39                      setTimeout( function () {
  40                          window.onbeforeunload = savedWindowOnBeforeUnload;
  41                      }, 1 );
  42                      return retval;
  43                  }
  44              } )
  45              .on( 'pageshow.editwarning', function () {
  46                  // Re-add onbeforeunload handler
  47                  if ( !window.onbeforeunload ) {
  48                      window.onbeforeunload = savedWindowOnBeforeUnload;
  49                  }
  50              } );
  51  
  52          // Add form submission handler
  53          $( '#editform' ).submit( function () {
  54              // Unbind our handlers
  55              $( window ).off( '.editwarning' );
  56          } );
  57      } );
  58  
  59  }( mediaWiki, jQuery ) );